Speed-reducing gear



Sept. 6, 1927. 1,641,845

y l T. L. FlTzPATRlcK SPEED REDUCING .GEAR

Filed May 1s,A 1927 2 sheets-sheen Patented Sept. 6, 1927.

THOMAS L. FITZPATRICK, OF MASSENA, NEW YORK.

SPEED-REDUCING GEAR.

.Application led May 3, 1927. Serial No. 188,448.

This Linvention relates to a speed reducing or speed. changing device, and has for an object to present an improved construction which may be readily adjusted to secure differ-ent speeds and transmit substantially any desired power.

Another object of the invention is toprovide a speed reducer infwhich-the parts are so arranged that the casing of the device will act as` means for receiving or transmitting thepower through a belt or other transmitu ting means.

In the accompanying drawings- Figure 1 is a longitudinal vertical` sectional viewthrough' a speed reducer, disclosing an embodiment of the invention.

Figure 2 is a top plan view of a1 belt and associated parts, including a speed reducer and power connections therefor.

Figure 8 is a transverse sectional 'view through Figure 1, approximately on line Figure 4 is a transverse sectional view through Figure 1 on line 4 4.

Figure 5 is a sectional view through Figure 1, on line 5-5. i Y

. Referring to tie accompanying drawings by numerals, 1 indicates a drum or casing to which end members 2 and f8 are secured in any desired manner, as for instance, by suitable screws 4. These end members are provided with openings 5 and 6 which carry bearing members?1 and 8, said bearing inembers preferably being of a well known ball bearing typ-e fitted properly into 4the opens ings 5 and G so as not to be accidentally removed. Arranged preferably substantially centrally of the drum or casing 1, is a ring 9 which is provided with internal gear teeth so that the member or ring 9 is in fact, an internal gear secured rigidly to the casing 1 by suitable means, as for instance, screws 10. Arranged adjacent the end lmember 2 is a member 11 which may be termed a spider, though preferably it is formed as a disk with a hub 12 extending through the bearing 7 by which it is supported. The hub 12 is pro vided with a bore 18 for receiving the re duced section 14 of the shaft 15. rIfhe spider or disk 11 is provided with a plurality of apertures 16, there being three to accommodate the three shafts 17, 18 and 19. At the opposite end, namely, at end'8, a'spider 2O is provided, which is identical in all respects with spider 11 except that the hub 21 has a larger bore for receiving the tubular shaft 22. Theends of the shafts 17, 18 and 19,. are journaled in the spider 20 in av similar manner to the way they are jouriia'led in spider 11. rIhres shafts have been shown as clearly illustrated in Figure 5, but if desired, agreater or even a less number could be used without departing fromthe spirit of the in vention. The tubular shaft 22 is adapted to receive power or transmit power as the case may be, and maybe provided with any sui table receiving or transmitting nuernbergl for instance, the sprocket wheel 28. rlhis rsprocket wheel, as shown in Figure 2, accommodates a sprocket chain 24, which passes over a sprocket wheel 25 carried by an elec-- tric motor 26. A belt 2T is fitted onto thc` casing 1 and also onto the drum 28, where by whenever motor 26 is operated, the belt 27 is caused to function. The tubular shaft 22 extends a short distance beyond the spider' 2() and has a pinion 28 formed integral therewith or rigidly secured thereto as preferred. The .bore 29 of shaft 22 accommodates the reduced end 8O of the shaft 15. Mounted on the reduced end 8O is also' a sleeve 81 which has rigidly secured thereto or formed integral therewith, a pinion preferably of the same size as pinion 28. A

gea'r wheel 88 is keyed or otherwise rigidly secured to the sleeve 80 adjacentthe pinion 82. Pinion 28 meshes with a gear .wheel 84 keyed or otherwise rigidly secured to the sleeve 85, which sleeve is rotatably mounted' ,fil .fil

on the reduced eXtensionBG of shaft 17, pinion 87 is formed integral with or rigidly secured to sleeve 85, said pinion-87 continually meshing with the gearwheel 88. A second sleeve, namely, sleeve 88, is rotatably mounted on the reduced extension 8G, said second sleeve having a gear wheel 89 rigidly secured thereto by a key or otherwise, said.

gear wheel 89 continually meshing with pinion 82. Sleeve 88 has formed integralV therewith or rigidly secured thereto, a pinion continually meshing with the teeth of the in-- ternal gear 9. The shafts 18 Aand 19 arer The various sleeves 38 transmit the power at three points through the pinions fit) to the internal geant). The hubs and 2l may be supported by any stationary objects which will hold these hubs stationary while power transmitted tl'irough shal't Q2 will cause the drum or easing l to rotate.

ls shown in the accompanying drawings, the gears are so proportioned as to give a certain ratio ot movement between the hollow shaft Q2 and the drum or casing l. It it should be desired to change the ratio, the various pinions and gears must be also changed and when rearrange@ the inechanism will operate as just set l'orth. ltA will also be evident. that` it desired, power could be applied through a belty or otherwise to the drum or casing` l and taken oil' through the shaft That l claim is:

l. il speed reducer oit the character described eoniiurising; a casing` circular in cross section, the periphery of which acts as a pub ley, means rigidly secured to the 'asing aet ing;l as end members a hollow driving shaft extending` through one oft said end members, a series oit toothed members for connectingthe hollow drivingv shaft with the casing so that the 'using will rotate at` a ditlerent speed :trom the hollow driving' shaft, and means 'for rotatably supporting the toothed members in the casing' said means including a central sliat't journaled at one end in one olf said end members and at the other end in said hollow shaft, a eountershatt arranged parallel to said central shaft, and disks rotatably supported on said end members acting,- to support said eountershatt at its respect-ire ends.

2. l speed reducer ot the character described comprising a casing, a gear ring` secured to the casing interiorly, means rigidly secured te the easingacting as end members a hollow driving shaft, a series et toothed members connecting the driving shat't with Various :fears P39.

reame/i5 the gear ringwhereby as the driving shalt is rotated the gear ring will be rotated and consequently the easing, said toothed members including three sets of gear members, actingas speed reducing structures with one set acting as means for transmitting power to the gear ring and means for rotatably supporting said three sets ot gear members, said means including` a central shatt- `iournaled at one end in one. ot said end members and at the other end in said hollow shaft, three counter-shafts arranged parallel to said central shaft, and a disl: rotatably mounted on each ot said end i'uemliiers, said disks being positioned to receive the ends of said countershatts `for supporting said countershaitts and allowing the countershatts to move in a. circle.

3. A speed reducer ot the character described comprisina a hollow casing, end members rigidly secured to the ends et said casing, a disk arranged interiorly of the casing' near each et said end members, each olf said disks' having a hollow hub extending,l through its adjacent end member, a hollow drive shaftv extending through one of said hubs :into the interior of the casing', a central shaft haring` one end journaled in said hollow shaft and the opposite end in the hub ot the disk at the opposite end et the casing, a series et auxiliary shatts spaced ti-om the central shatt` positioned with their ends journaled in said disks, an internally toothed ring' rigidly secured to the interior ot the easing, a pinion rotatably inounted on each el the auxiliary shafts meshing` with said gear ring, and a series el gear wheels connected with each oit said pinions, some et said geared members being rotatably mounted on the auxiliary shafts and otllers on said' central shaft, and a master toothed member rigidly secured te said hollow shal't meshingwith one geared member en each of said auxiliary shafts.

THOMAS L. FITZPATRICK. 

